Hearthpwn

Because in the World of Warcraft, Naxxramas is not a PvP zone, since you can only enter with the members of your raid group. Clearly it doesn't make sense to be fighting against anyone other than the undead scourge inside of those halls! 

Your secrets are only active on your opponent's turn. You cannot activate your own secrets. 

In my opinion, what your deck lacks is a cohesive strategy. That requires you to know what the difference is between a rush deck, a midrange deck, and a control deck. There are guides and tutorials available to help explain those. If you you think you know what they are, then try actually writing down what your strategy is for  that deck, and how each card choice contributes to advancing that strategy. Right now you have many cards that are cheap and may contribute to trying to build an early board presence, that is seems you are trying to do some sort of early-midgame rush deck. But none have more than 2 health, only one has a deathrattle, and the only buff you have for them is the defender of argus. So they all die pretty early, and none stick around (other than the naxx spiders, which leave you with 2 1/1s). Your midgame is pretty much only flamestrike, mirror image and fireball. Flamestrike is really best if you're trying to come back from behind, but then you're still left at the end of that turn only with what has managed to be on the board so far, which probably isn't much. You have no end game at all. No big fat minion to slap down, nothing that will stick around, no big high damage spell. Basically, all the eggs in your basket are in trying to build an early game, but you have no charge minions, no divine shield, no card draw, only 1 boost, and only 1 deathrattle. 

If you want to continue to try early, rush decks, look into making a warlock zoo deck. You could also try to make a mage weenie deck, but that requires a greater awareness of interactions, to be able to know when to use your hero power to damage your own minions. 

It is also helpful to know how to make "good" trades. This requires thinking different about what damage is, what life is, and what card advantage is. A good guide for that is: http://www.hearthpwn.com/forums/hearthstone-general/general-discussion/2916-the-three-competing-resources-tempo-card-advantage

Fun story: I have almost every card (missing 3 legendaries, far sight and twisting nether), and have been saving up gold fire Naxx. My wife started playing much later than I did, and only has maybe half of the cards. She really wanted Tirion, got frustrated that it wasn't dropping, and finally crafted him. Before the Naxx prices were announced I got to 5k gold and decided to go ahead and open a pack, and it was Tirion! (Which I already had). She got passed at me. Then last week once prices came out I bought packs to get down to 2800 gold, and this time got a Golden Tirion! I couldn't stop laughing!

Quote from Zlimex »

I think I read somewhere that you can't choose your own deck. I think you are given a pre-made deck or make a deck at that single boss. Atleast this would make the most sense, and i'm pretty sure I read it somewhere. Sorry for not having the source of this info.

That's how the class challenges go. To win the class-specific cards, you have to use pre-made decks. 

You can have duplicates of legendaries in the Arena, just as you can have more than 2 copies of other non-legendary cards. 

I'm glad you decided to play that way. However, it has existed for a while, called Hearthstone Roulette. I have made many friends playing that way. 

I have been using a druid mill deck to do quests all month (when possible), with decent results. Haven't thouht to take it into ranked, though it couldn't hurt since I am only at 9 and haven't tried to climb for over two weeks

because when you combo it with windfury, you get 6 dmg for 1 mana

I see you have not yet combined:

(Turn 7) Innervate + Cenarius
(Turn 8) Mark of the Wild + Faceless 

for 2x 7/10 with taunts

Yeah, when I was thinking of a Troll deck I started thinking of things that were even semi-Troll related like some of the hunter weapons, raptor, King Krush, etc. Still couldn't get to 30 cards :( 

I was reading comments on a rogue deck here on this site, and people were calling it a "Troll deck". That got me thinking of if I could actually build a deck using just Troll cards. Turns out, you can't. At least not yet. That led me to do a cursory survey of the various races represented on HS Minions. I did not count spells, just cards with an attack and health value. The results are: 

Alliance 67
Humans 32
Gnome 14
Night Elf 7
Draeni 7
Dwarf 4
Worgen 3

Horde 49
Orc 13
Undead 11
Blood Elf 9
Goblin 6
Troll 5
Tauren 5

Pandarian 3

Non Playable Races / Categories
"Other" (not enough to make individual categories) 31
Animals 25
Demon 10
Elemental 10
Dragon 9
Murloc 9
Ancients 3
Totem 2

Which races would you like to see more cards of?

Ebichman,  those cards destroy weapons and activate deathrattles. 

On topic: I am waiting for the "unsilence"  card

I find zoo to be a very favorable match up for me. I take some damage from turns 1-3, but then I start dropping taunts most every turn, and they can't keep up. Force some discards from their use of soulfire and doomguard, and you have them top-decking and lifetapping for some grip, but by then it is too late as I snowball my heals out, more taunts, and have my spells ready to wrath/swipe/starfall the heck out of them

My hobby: MOTW their Sylvannas, Faceless + BGH my own. Left with a 7/7 taunt deathrattle: MC.